In wordpress it's fairly simple.
When you are in the screen writing your post, scroll down a bit below the edit/text box and you'll see a section that says "Tags" in the text area below that you just type in the tags you want.
If your post is about the economy for instance you might tag it with words such as "money, economy, stock market, recession, housing crunch" or any number of words related to the topic of your post.
Once you've added the tags you want, just click the "add" button and then save or publish ( or both )
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